A B727-200 WAS DISPATCHED IN NON COMPLIANCE WITH #1 EGT EXCEEDING MAINT MANUAL LIMITS.

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ON APR/TUE/02 AT APPROX XA40; I WAS NOTIFIED BY OUR MAINT TWR COORDINATOR THAT FLT WOULD BE ARRIVING WITH THE FOLLOWING LOG WRITE-UP: '#1 ENG MOMENTARILY EXCEEDED 630 DEGS ON CLBOUT AFTER TKOF. ALL OTHER INDICATIONS NORMAL.' DUE TO THE FACT THAT I WAS BUSY WORKING ANOTHER FLT; I ASKED THE TWR COORDINATOR TO CHK THE ENG HISTORY. I ALSO ASKED THE LEAD TECHNICIAN ON DUTY TO ACCESS THE EXCEEDANCE CHART. I WENT BACK AND FINISHED THE ACFT THAT I WAS CURRENTLY WORKING ON. FLT ARRIVED AT XA55. I ENTERED THE COCKPIT AT XB05. THE FLC WAS GONE BUT THEIR BAGS WERE STILL ON BOARD. I OPENED THE LOGBOOK AND DISCOVERED 3 ADDITIONAL LOG WRITE-UPS. I PROCEEDED TO THE OFFICE TO LOCATE MY PARTNER FOR SOME HELP. WHILE IN THE OFFICE; THE LEAD TECHNICIAN TOLD ME THE EXCEEDANCE WAS WITHIN LIMITS AND THERE WAS NO PREVIOUS EGT HISTORY. I RETURNED TO THE COCKPIT TO WORK OFF THE OPEN LOG ITEMS. A FLC MEMBER WAS IN THE COCKPIT. I TOLD HIM I NEEDED A TIME INTERVAL OF THE EXCEEDANCE. HE SAID IT WAS MINOR AND ADDED 10 SECONDS TO THE LOG WRITE-UP. I PROCEEDED TO HELP WORK OFF THE 3 OPEN LOG ITEMS AND RETURNED TO THE OFFICE WITH THE LOGBOOK TO SIGN OFF THE ENG EGT EXCEEDANCE. I ACCESSED THE ENG TEST REQUIREMENTS IN THE B727 PREFLT HANDBOOK. IT STATED 'ACCELERATION EGT OF 620-630 DEGS C APPLIED DURING THE FIRST 2 MINS OF A NORMAL TKOF REQUIRE NO ACTION. BEYOND 2 MINS REQUIRES ENG REMOVAL AND A COMPLETE HOT SECTION INSPECTION. I SIGNED OFF THE LOG ITEM AS OK PER PLT'S FLT HANDBOOK 04-0-7-7 PAGE 34. THE AFT DEPARTED SLC AT XB23. MY MISTAKE WAS MISREADING THE LOG ITEM. THE LOG ITEM STATED EXCEEDED 630 DEGS C AND I KEPT THINKING THE EXCEEDANCE WAS 630 DEGS C; WHICH MADE THIS WITHIN LIMITS.